Q: Calculate the force between two charges of $$20.0 \ \mathrm{C}$$ each, separated by $$0.5 \ \mathrm{m}. $$Use $$k = 9.0 \times 10^9$ \ \mathrm{N} \cdot \mathrm{m}^2/\mathrm{C}^2.$$

$$1.44 \times 10$$^{13}$$ \ \mathrm{N}$$

Question 1

Which subatomic particle is responsible for the transfer of charge in electrostatics?

Accepted Answer

Electron

Question 2

An object becomes negatively charged when it:

Accepted Answer

Gains electrons

Question 3

According to the Law of Conservation of Charge, if one object loses $$5 \ \mathrm{C} of $$charge, what must happen to another object?

Accepted Answer

It must gain $$5 \ \mathrm{C} of $$charge

Question 4

Which of the following best describes the direction of electric field lines around a positive charge?

Accepted Answer

They point away from the charge

Question 5

A glass rod is rubbed with silk and becomes positively charged. What happens at the atomic level?

Accepted Answer

The glass rod loses electrons to the silk

Question 6

Which material is most likely to be a good conductor of electricity?

Accepted Answer

Copper

Question 7

If two objects are both positively charged, what will happen when they are brought close together?

Accepted Answer

They will repel each other

Question 8

Which process describes charging an object by direct contact with another charged object?

Accepted Answer

Conduction

Question 9

A neutral metal sphere is touched by a negatively charged rod. What is the resulting charge on the sphere?

Accepted Answer

It becomes negatively charged

Question 10

Which of the following statements about insulators is correct?

Accepted Answer

Their electrons are tightly bound and do not move easily

Question 11

If the distance between two point charges is doubled, what happens to the electrostatic force between them according to Coulomb’s Law?

Accepted Answer

It becomes one-fourth as large

Question 12

Calculate the force between two charges of $$20.0 \ \mathrm{C}$$ each, separated by $$0.5 \ \mathrm{m}. $$Use $$k = 9.0 	imes 10^9$ \ \mathrm{N} \cdot \mathrm{m}^2/\mathrm{C}^2.$$

Accepted Answer

$$1.44 	imes 10$$^{13}$$ \ \mathrm{N}$$

Question 13

Which of the following is an example of charging by friction?

Accepted Answer

Rubbing a balloon on your hair

Question 14

A neutral object is brought near a negatively charged object. What happens?

Accepted Answer

The neutral object is attracted

Question 15

Which of the following best describes the field lines between a positive and a negative charge?

Accepted Answer

They go from positive to negative

Question 16

If the charge on one of two interacting objects is tripled, what happens to the force between them?

Accepted Answer

It is tripled

Question 17

Which of the following is true about the process of grounding?

Accepted Answer

It allows an object to gain or lose electrons without becoming noticeably charged

Question 18

A plastic rod is rubbed with fur and becomes negatively charged. What happens to the fur?

Accepted Answer

It becomes positively charged

Question 19

Which of the following best explains why metals are good conductors?

Accepted Answer

They have free-moving electrons

Question 20

If the distance between two charges is halved, what happens to the force between them?

Accepted Answer

It is quadrupled

Electrostatics and Charge: Mini-Textbook Study Notes

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